## Abstract A class of almost unbiased ratio estimators for population mean ฯ is derived by weighting sample ฯ = (1/__n__) ฯ __y__~__i__~, ratio estimators ฯ and an estimator, ฯ (__y__~__i__~/__x__~__i__~). It is shown that NIETO DE PASCUAL (1961) estimator is a particular member of the class and a
On a Class of Almost Perfect Sequences
โ Scribed by K.T. Arasu; S.L. Ma; N.J. Voss
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 210 KB
- Volume
- 192
- Category
- Article
- ISSN
- 0021-8693
No coin nor oath required. For personal study only.
โฆ Synopsis
Periodic "1 sequences all but one of whose out-of-phase autocorrelation w x coefficients are zero are studied by Wolfmann 9 . Using the equivalence of these ลฝ almost perfect sequences to certain classes of cyclic divisible difference sets as w x. ลฝ noted by Pott and Bradley 7 , we investigate the case s 2 in the terminology of w x. 9 . Sequences of periods 8, 12, and 28 are given and several nonexistence results are obtained. Our results suggest that it is unlikely to have such sequences for periods greater than 28.
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